Siri

Siri is a virtual assistant with a voice-controlled natural language interface that uses sequential inference and contextual awareness to help perform personal tasks for iOS users. Spun out of the DARPA-funded CALO project, Siri was initially developed by Dag Kittlaus and his team of SRI International as an iPhone app. Apple bought Siri in 2010. In October of 2011 Apple re-released it as part of iOS 5. Siri is currently run by Bill Stasior, vice president, Siri, and the technology is integrated into the iPhone, iPod touch, and iPad, and into Apple's new HomeKit home automation framework.

Siri was re-introduced with a new interface as part of iOS 5. Although it no longer enjoyed the same level of partner integration it had as an independent app, Apple's Siri better integration with built-in services like iMessage, Mail, Calendars, Reminders, Notes, Stocks, Weather, Music, Safari, and a few external services like Google and Wolfram Alpha. It could also tie into Find my Friends.

With iOS 6 Siri made compatible with the iPad, and gained the ability to provide information about sports, movies, and restaurants, as well the ability to open apps, post Facebook or Twitter updates, and hook into Apple's new Maps app for turn-by-turn navigation.

With iOS 7 Siri got a facelift to match the new design language, new, higher-quality voices, access to Settings and Voice Mail, the ability to display tweets from Twitter, tie ins to Wikipedia and Bing,

iOS 7.1 brought Siri integration with the new CarPlay feature. Siri also gained higher quality voices for Mandarin Chinese, U.K. English, Australian English, and Japanese, and a new push-to-talk feature to better control when Siri starts listening, and when it stops.

In iOS 8 Siri is gaining the ability to listen for the "Hey, Siri" command while plugged in. This is meant to help people while driving, while in bed, while cooking in the kitchen, or while likewise too far away or occupied to use the Home button for activation.

Siri is also being integrated into Apple's HomeKit framework so it can be used to control home automation. For example, saying "Good night Siri!" could make sure your garage is locked, lights and TVs are off, and temperature is reduced.

While Siri itself is integrated into the iOS Springboard system, the Siri team is still run quasi-independantly at Apple. Arguably modularizing Siri and integrating the team could allow for a broader scope of services over time. Apple has not yet released Siri for OS X on the Mac, nor have they provided an application programming interface (API) for developers to hook into. (Though it's unclear how that might affect partnership deals, and how collisions could be handled.)

Also, unlike Google Now, Apple hasn't yet put Siri on-board iOS devices, meaning even local tasks like setting alarms have to go out to the internet, allowing the network to affect performance. Likewise, Apple has thus far refrained from adding prescience to Siri, which would allow it to provide information before being asked.

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Siri, originally created as a stand-alone App Store app by Dag Kittlaus, Adam Cheyer, and Tom Gruber, was bought by Apple and integrated into iOS 5 for the iPhone 4s launch in 2011.
A digital assistant with sequential inference and context awareness, Siri answers questions and executes commands...

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